import sys

N, M = list(map(int, input().split()))
a = list(map(int, input().split()))
g = [[] for i in range(N)]
for i in range(M):
    u, v = list(map(int, input().split()))
    u -= 1; v -= 1
    
    g[u].append(v)
    g[v].append(u)
    
for i in range(N):
    q = [v for v in g[i]]

    for v in q:
        n = [(a[i], a[v], a[u]) for u in g[v] if a[i] != a[u] and a[v] != a[u]]
        for s in n:
            if min(s) == a[v] or max(s) == a[v]: 
                print('YES')
                sys.exit()

print('NO')